**Science 9 Lesson Plan – Ohm’s Law**

*Tasks: *

Use graphics, audio and video to understand ohm’s law to calculate resistance

*General Outcome: *

Describe technologies for transfer and control of electrical energy

*Specific Outcomes:*

- Apply Ohm’s law to calculate resistance, voltage and current in simple circuits

*Prerequisite Knowledge: *

- Students should be familiar with a basic, 3 variable formula using multiplication. Ex. Speed = Distance / Time
- Students should know that Voltage (V) is measured in Volts (V) and Current (I) is measured in Amps (A)

**Plan For Diversity:**

- Students will have a copy of the triangle formula they can refer to.
- There are different components to the lesson, ie. graphics, audio, video, readings, so that students who have various learning needs can be successful

**Lesson:**

**Introduction (Time 5 min):**

Students will look at the graphic. They should be looking at the triangle, formula and example so that they can answer the following questions:

**Practice (Time 15 min):**

- An alarm clock draws 0.5 A of current when connected to a 120 volt circuit. Calculate its resistance.
- A subwoofer needs a household voltage of 110 V to push a current of 5.5 A through its coil. What is the resistance of the subwoofer?
- Find the resistance of a bulb if a circuit contains a 1.5 volt battery and generates a current of 0.5 A

**Explanation (Time 5 min):**

Students will listen to the audio file where they are trying to gain a better understanding of resistance, the instruments used to measure them, and how voltage, current and resistance are related.

**Review (Time 5 min)**

Students will watch the video on Calculating Resistance Using Ohm’s Law. This should reiterate the formula and also stress the importance of using the correct units.

calculating resistance powtoon

**Discussion**

This multimedia enhanced lesson incorporates graphics, audio and video and is completely deliverable online. Mayer defines multimedia learning as ‘learning from words and pictures. The words can be printed text or spoken text. The pictures can be in static form, such as illustrations, photos, diagrams, charts, or maps, or in dynamic form, such as animation or video.’ (Mayer, R. 2008). The idea is that students gain an understanding of Ohm’s Law and the fact that Resistance = Voltage / Current with the help of printed and spoken text, diagrams, and animation. There are also some practice questions as these simple questions allow the students to get instant formative feedback and help them build the fundamentals in using Ohm’s Law.

There are graphics with colour and contrast so that they can look further into the Voltage and Current formulae as well. The main format of the lesson plan is chunked into sections and I have incorporated the following strategies.

‘Strategies for chunking include:

- using paragraph breaks to signal changes in topic or sub-topic
- use headings to indicate meaningful chunks of your text
- putting your content in order, consider using numbering if the sequence is an important aspect of your content
- if your content is not sequential, putting important chunks first or last – but explicitly pointing out your strategy’ (Webster, K. 2014)

The audio is direct and to the point as Carter notes, ‘(g)ood practice has the information being presented in a “news-like style” (Ferrington, 1994a, p. 63). The information also needs to be delivered in a direct manner, and without inflections, unless emphasis on particular content is intended.’ (Carter, C. 2012). The topic is specific and allows the learner to focus on resistance but also start looking at the relationships between voltage and current without having them stray too far from Ohm’s Law.

I had a little fun making the animation. I hadn’t used PowToon before but had seen my students use it for some of their assignments so thought I would try it. Familiarity tends to engage students more. The animation is also at the end of the lesson purposefully. Not only is it somewhat entertaining and light-hearted so that students should remember it better, but it reviews and summarizes the concepts taught throughout the lesson. This last step of the lesson plan is sometimes forgotten as lessons can occasionally be rushed but it is extremely important to reiterate the outcomes and concepts taught at the end of the lesson to tie the lesson together.

**References**

Carter, C. (2012). Instructional Audio Guidelines: Four Design Principles to Consider for Every Instructional Audio Design Effort. *Techtrends: Linking Research & Practice To Improve Learning*, *56*(6), 54-58.

Mayer, Richard E (2008). “Applying the Science of Learning: Evidence-Based Principles for the Design of Multimedia Instruction” *American Psychologist*, November 2008, pp. 760-769.

Webster, K.S. (2014). Text Design for Online Learning.

http://courses.olblogs.tru.ca/eddl5131-jan17/week-2-text/text-design-for-online-learning/

Hi Markku,

Thanks for sharing your enhanced lesson. I like how you have provided simple graphics and examples for your students so they know exactly how to solve the questions. I also very much enjoyed the Powtoon video. I’ve also been exploring free online animation makers such as animaker.com and renderforest.com but Powtoon looks kid friendly and could be a useful tool to get students to remember concepts. I’ll have to check it out!

Great lesson Markku. I also really like your Powtoon video. It’s something I have known about for awhile but just haven’t made one yet. The one difficulty I have had with the theme of your WordPress is the colour of the hyperlinks. I find the colour does not contrast very well with the rest of the text and I don’t realise that it is actually a hyperlink at first. I think this is pre-set in the template you chose when you set up your blog, but I just thought I would mention it. Your audio file is nice too. You have a great recording voice!!

Abbi